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Analog Devices Inc. AD574AKNZ
- Part No.:
- AD574AKNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AD574AKNZ.pdf
- Description:
- IC ADC 12BIT SAR 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,433
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Product details
Overview
AD574AKNZ from Analog Devices is a complete 12-bit monolithic successive-approximation analog-to-digital converter (ADC) with internal reference, requiring no external components for full conversion functionality. It delivers ±1/2 LSB linearity error over 0°C to +70°C, supports ±5 V/±10 V bipolar and 0–10 V/0–20 V unipolar input ranges, and achieves 35 µs max 12-bit conversion time - used in precision data acquisition systems for industrial process control and test instrumentation.
For engineers reviewing the AD574AKNZ datasheet, AD574AKNZ pinout, AD574AKNZ application, or AD574AKNZ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support for production deployment.
Technical Context
The AD574AKNZ implements a fully integrated SAR architecture with on-chip 12-bit current-output DAC, comparator, clock generator, and control logic - eliminating need for external timing or calibration components. Its buried Zener reference delivers 10.00 V ±0.2% with ±27 ppm/°C full-scale temperature coefficient and supplies up to 1.5 mA to external loads.
Digital interface supports dual-mode operation: 12-bit parallel output or byte-accessible 8-bit mode via AO and 12/8 pins, with STS status flag and CE/CS/R/C control protocol compatible with microprocessor buses. Input impedance is 5 kΩ (10 V span) or 10 kΩ (20 V span), and analog common (Pin 9) serves as high-fidelity ground reference for both reference and comparator circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 discrete digital codes across full input range, enabling 2.44 mV LSB step size for 10 V span. |
| Linearity Error (TMIN–TMAX) | ±1/2 LSB - guarantees monotonicity and ensures no code transitions deviate more than half an LSB from ideal transfer curve over 0°C to +70°C. |
| Differential Linearity | No missing codes guaranteed to 12-bit resolution - all 4096 codes appear in monotonic sequence across full temperature range. |
| Conversion Time | Max 35 µs for 12-bit cycle - defines minimum sampling interval for dynamic signals; supports ≤26 kHz input bandwidth when paired with AD585 SHA. |
| Reference Voltage | 10.00 V ±0.2% (9.98–10.02 V) - internally trimmed Zener source with ±27 ppm/°C full-scale TC, usable directly for calibration or external buffering. |
| Input Ranges | Bipolar: ±5 V, ±10 V; Unipolar: 0–10 V, 0–20 V - selectable via pin-strapping without external resistors, supporting direct connection to transducer outputs. |
| Power Supplies | VLOGIC = +4.5–+5.5 V; VCC = +11.4–+16.5 V; VEE = –11.4––16.5 V - dual-supply operation enables true bipolar signal handling with rail-to-rail analog input capability. |
Pinout & Package
AD574AKNZ is supplied in a 28-pin plastic DIP (N-28) package with 0.600-inch body width and standard through-hole footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | Digital Common (DC) | Ground reference for logic inputs/outputs; must be tied to system digital ground and connected to Pin 9 (AC) at package for optimal noise rejection. |
| 9 | Analog Common (AC) | Primary ground reference for internal reference, comparator, and analog input circuitry - requires low-impedance connection to system analog ground. |
| 8, 10 | REF OUT / REF IN | 10 V reference output and input; internal 10 V Zener connects to REF OUT; external 50 Ω resistor between REF OUT and REF IN enables full-scale calibration trim. |
| 12 | BIP OFF | Bipolar offset adjustment node - connected to 10 V reference for bipolar mode or grounded for unipolar mode; trimmable via external potentiometer. |
| 13, 14 | 10VIN / 20VIN | Dedicated analog input pins for 10 V span (5 kΩ input impedance) and 20 V span (10 kΩ input impedance); accept signals beyond supply rails. |
| 2, 3, 4, 5 | DB11–DB0 | 12-bit parallel digital output bus - three-state buffered; output format (12-bit word vs. two 8-bit bytes) controlled by 12/8 pin. |
| 6 | STS | Status flag - high during conversion, low when result ready; used for handshaking with microprocessor or DMA controller. |
| 16, 17, 18 | CE, CS, R/C | Control logic inputs - CE/CS enable device; R/C selects convert (low) or read (high); timing-critical with min 300 ns pulse widths. |
| 20, 21 | A0, 12/8 | Data addressing - A0 selects MSB nibble (low) or LSB nibble (high); 12/8 configures output format (VLOGIC = 12-bit, DC = byte mode). |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 10 V reference | Eliminates need for external voltage reference IC or trimming network - reduces BOM count and layout area while maintaining ±0.2% initial accuracy. |
| Guaranteed no missing codes | Ensures monotonic behavior across full 12-bit range and operating temperature - critical for closed-loop control where code reversals cause instability. |
| Selectable 8-/12-bit conversion | Reduces conversion time to 24 µs (8-bit) for lower-resolution tasks - enables adaptive sampling strategies without changing hardware. |
| Internal thin-film resistor network | Factory-trimmed scaling resistors provide absolute calibration - eliminates field calibration in many applications and improves repeatability across units. |
| Three-state parallel output | Direct interface to 8- or 16-bit microprocessor buses without external latches or buffers - simplifies timing and reduces component count. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Continuous digitization of 4–20 mA loop outputs from pressure, temperature, and flow sensors in PLC-based control cabinets. IC Role / Device Role / Timing Role: Primary ADC capturing sensor voltage after I/V conversion; operates in unipolar 0–10 V mode with 35 µs conversion cycle synchronized to scan rate. Use Value: ±1/2 LSB linearity ensures <0.012% measurement uncertainty across 0–100% range - meets SIL-2 functional safety requirements for loop integrity verification. | Use Scenario: High-accuracy DC parametric testing of op amps and voltage references using programmable source-measure units. IC Role / Device Role / Timing Role: Precision digitizer for measuring DUT output voltage under varying load conditions; configured for ±10 V bipolar input with external buffer. Use Value: No missing codes and 12-bit resolution enable detection of sub-mV drift over temperature - supports 16-bit effective resolution via averaging in production test firmware. |
| Medical Instrumentation | Avionics Data Acquisition |
Use Scenario: Digitizing ECG, EEG, and respiration waveforms in portable patient monitors with battery-powered analog front-end. IC Role / Device Role / Timing Role: Signal chain ADC operating from ±12 V supplies; uses internal reference and 0–10 V unipolar input scaled from instrumentation amplifier output. Use Value: ±27 ppm/°C full-scale TC ensures <±0.02% gain drift from 0°C to +50°C - maintains diagnostic accuracy without recalibration during clinical use. | Use Scenario: Capturing analog telemetry from flight control sensors (accelerometers, gyros) in ruggedized airborne data recorders. IC Role / Device Role / Timing Role: Radiation-tolerant ADC in MIL-STD-883 qualified variant; interfaces to 16-bit bus via AO/12/8 control for deterministic read timing. Use Value: 35 µs conversion time allows 28.5 kSPS sampling - satisfies DO-160E Category D transient immunity requirements with minimal latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7874KNZ | Successive-approximation ADC with 12-bit resolution, but requires external reference and clock; no internal 10 V reference or auto-calibration. | Suitable for systems where reference flexibility or lower power (<250 mW) is prioritized over integration. | Select AD7874KNZ only if external reference sourcing and board space for clock generation are acceptable trade-offs. |
| ADS7800KP | 12-bit sampling ADC with 10 µs conversion time; includes sample-and-hold but no internal reference - requires external 10 V reference. | Better suited for high-speed multiplexed channel acquisition where throughput >100 kSPS is required. | Choose ADS7800KP when system-level speed outweighs integration benefits - note that external reference adds ±0.5% initial error not present in AD574AKNZ. |
Compared with AD7874KNZ and ADS7800KP, the AD574AKNZ offers superior out-of-box accuracy due to its factory-trimmed internal reference and guaranteed ±1/2 LSB linearity, reducing calibration effort in industrial and medical designs - though at the cost of higher power (725 mW) and slower conversion than ADS7800KP.
Availability
AD574AKNZ is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, medical instrumentation, and avionics data acquisition requiring stable component supply and long-term obsolescence management.
Supply support for AD574AKNZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Wilmington, MA.
The AD574A product line was designed for precision data acquisition in environments demanding guaranteed linearity, integrated reference stability, and microprocessor-compatible control - targeting industrial, aerospace, and medical instrumentation markets.
FAQ
What is the maximum conversion time for AD574AKNZ in 12-bit mode?
The AD574AKNZ has a maximum conversion time of 35 µs in full 12-bit mode, as specified in the timing section of its datasheet. This value is guaranteed across the full 0°C to +70°C operating temperature range and applies when using the internal clock and standard ±15 V supplies. The typical conversion time is 24 µs. For faster sampling, the AD574AKNZ supports an 8-bit mode with 24 µs max conversion time - useful when reduced resolution is acceptable for higher throughput. AD574AKNZ performance remains stable under VCC = +12 V or +15 V and VEE = –12 V or –15 V conditions.
Does AD574AKNZ require external calibration components?
No, the AD574AKNZ does not require external calibration components for basic operation. Its internal thin-film resistor network and buried Zener reference are factory-trimmed to deliver ±1/2 LSB linearity and 10.00 V ±0.2% reference voltage. Offset and full-scale trims are optional: unipolar offset is adjustable via Pin 12, and full-scale calibration uses a 50 Ω resistor between REF OUT (Pin 8) and REF IN (Pin 10). These adjustments are only needed when system-level accuracy exceeds the AD574AKNZ's inherent ±0.25% full-scale error. AD574AKNZ achieves this level of integration without external DACs, op amps, or reference ICs.
Can AD574AKNZ operate with ±12 V power supplies instead of ±15 V?
Yes, the AD574AKNZ is fully specified to operate with ±12 V supplies (VCC = +12 V, VEE = –12 V) in addition to ±15 V. Its power supply rejection specifications explicitly cover both ranges, with full-scale calibration shift limited to ±1 LSB under VCC = +12 V ±0.6 V or VEE = –12 V ±0.6 V. However, when using ±12 V, the internal reference output current capability drops - Analog Devices recommends buffering the REF OUT with an op amp (e.g., AD708) if external loading exceeds 1 mA or varies during conversion. AD574AKNZ maintains all key specs including linearity and conversion time under ±12 V operation.
What analog input ranges does AD574AKNZ support, and how are they selected?
The AD574AKNZ supports four analog input ranges: ±5 V, ±10 V (bipolar), and 0–10 V, 0–20 V (unipolar). Selection is determined by external connections, not register settings: ±5 V uses 10VIN (Pin 13) referenced to AC (Pin 9); ±10 V uses 20VIN (Pin 14); 0–10 V connects signal between 10VIN and AC; 0–20 V connects between 20VIN and AC. Bipolar mode requires BIP OFF (Pin 12) tied to REF OUT; unipolar mode grounds Pin 12. Input impedance is 5 kΩ for 10 V spans and 10 kΩ for 20 V spans - all ranges are supported simultaneously by the same AD574AKNZ device without hardware changes.
Is AD574AKNZ pin-compatible with other AD574A grade variants like AD574AJNZ or AD574ALNZ?
Yes, AD574AKNZ is pin-compatible with all other AD574A variants including AD574AJNZ and AD574ALNZ - they share identical N-28 plastic DIP packaging, pinout, and electrical interface. The difference lies solely in performance grading: AD574AKNZ guarantees ±1/2 LSB linearity and 12-bit no-missing-codes over 0°C to +70°C, whereas AD574AJNZ guarantees ±1 LSB linearity and 11-bit no-missing-codes. AD574ALNZ offers tighter full-scale TC (10 ppm/°C vs. 27 ppm/°C). All variants use the same PCB footprint and control logic, allowing drop-in replacement in designs where higher-grade specs are not required. AD574AKNZ maintains full functional compatibility with AD574AJNZ and AD574ALNZ at the board level.
AD574AKNZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- ±11.4V ~ 16.5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD574AKNZ FAQ
1.How can I place an order for AD574AKNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD574AKNZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD574AKNZ reliable?
The price and inventory of AD574AKNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD574AKNZ is usually 5 days.
3.What payment methods are accepted for AD574AKNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD574AKNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD574AKNZ?
AD574AKNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD574AKNZ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD574AKNZ?
For technical support, including AD574AKNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD574AKNZ requirements.
6.How does Aetrix verify that AD574AKNZ is sourced from the original manufacturer or authorized distributors?
All AD574AKNZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD574AKNZ meets industry standards.
7.What is the process for return or replacement of AD574AKNZ?
All AD574AKNZ units undergo pre-shipment inspection (PSI). If there is an issue with AD574AKNZ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD574AKNZ part is unused and in its original packaging.
Return procedure for AD574AKNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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